As part of the UTF-8 cleaning up done in JDK-8301971, I looked at where and how we are using unicode sequences ("\uXXXX"). In several string literals, I think the unicode sequences still has merit, if they improve clarity or readability of the code. Some instances are more gray zone. But the places where it does not make sense at all are in comments, as part of fluid text comments. There they are just disruptive and not helpful at all. I tried to locate all such places (but I might have missed places, I did not do a proper lexical analysis to find comments) and fix them.